Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9dcebf351d8799761a8c6b56a13f6745228aeec41e93c33f929fbab00bd762' 
  AND token = 'KGIcbCj2UgDGdhgEvTE4htMae09CzgltNQBRxst3wII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}